It's important for consumers to "take control of their accounts to get maximum benefits," said Dr. Stephen Neeleman, founder of HealthEquity, a Utah-based company that manages more than $2.6 billion deposited in 1.5 million health savings accounts held by individuals and families.

Here are a few ways to make the most of your HSA:

Know what expenses are eligible. Do some research to find out what health-related costs can be paid with HSA funds. Even massages and acupuncture may qualify as legitimate expenses, as long as your health insurance plan permits it.

Understand the rules for withdrawals. One of the best perks is that you can withdraw HSA funds tax-free for qualified medical expenses, but some restrictions may apply. Make sure to withdraw your funds properly.

Contribute as much money as you can. Automatic payroll deductions make it simple to build savings. In 2016, individuals can put up to $3,350 into their HSA, and families can contribute $6,750, a $100 increase over this year. Those age 55 and older can contribute an extra $1,000.

You may also be able to use an HSA to bank against future health-care expenses, by investing unused HSA money in mutual funds or other investments. So check out your HSA-related investment options. They can provide a savings account for health-care needs in retirement.

"As the value of your HSA grows and you have enough to cover unexpected health-care expenses, consider investing the part not needed for expenses in mutual funds within your HSA," said Dr. Carolyn McClanahan, a financial advisor and founder of Life Planning Partners in Jacksonville, Florida. "This may be a good way to generate returns. Although as with all investments, the value can go down."